Doug Fister allowed just one (unearned) run over 7 1/3 innings and Adam LaRoche launched a pair of home runs as the Nationals bested the visiting Mets 7-1 on Wednesday night in Washington, D.C.

Even the slumping Bryce Harper got in on the act with a fourth-inning single, a sixth-inning walk, and a run scored. That after finishing 0-for-4 with three strikeouts in a 6-1 loss to New York on Tuesday.

With the Braves falling Wednesday afternoon to the Mariners — the eighth straight loss for Atlanta — the Nats are now four games up in the NL East.

Fister missed the first month of the season with a lat strain, but he’s now suddenly an ace …

Since getting hammered for seven runs on nine hits in his May 9 Nationals debut, Doug Fister has a 2.15 ERA in 100 1/3 innings.

Nava began the season on a one-year contract with the Angels, during which he slashed .235/.309/.303 through 136 PA in the first half of 2016. He was flipped to the Royals in late August for a player to be named later and saw the remainder of his year go down the drain on an .091 average through 12 PA in Anaheim. After getting the boot from the Angels’ 40-man roster in November, the 33-year-old outfielder elected free agency.

Nava is expected to compete for a bench role on the Phillies’ roster in the spring. As it currently stands, the club’s projected 2017 outfield features Howie Kendrick and Odubel Herrera, with precious little depth behind them. Nava’s bat is underwhelming, but at the very least he offers the Phillies a warm body in left field and a potential platoon partner for one of their younger options, a la Tyler Goeddel or Roman Quinn.

Former Mets catcher Johnny Monell signed a contract with the KT Wiz of the Korea Baseball Organization, per a report by Chris Cotillo of SB Nation. The 30-year-old originally struck a deal with the NC Dinos on Thursday, but the deal appeared to fall through at the last minute, according to Cotillo’s unnamed source.

Monell last surfaced for the Mets during their 2015 run, batting a dismal .167/.231/.208 with two extra bases in 52 PA before the club DFA’d him to clear space for Bartolo Colon. While he’s had difficulty sticking at the major league level, he’s found a higher degree of success in the minor league circuit and holds a career .271 average over a decade of minor league play. He played exclusively in Triple-A Las Vegas during the 2016 season, slashing .276/.336/.470 with 19 home runs and a career-high 75 RBI in 461 PA.

The veteran backstop appears to be the second MLB player to join the KT Wiz roster this offseason, as right-hander Donn Roach also signed with the club last month on a one-year, $850,000 deal.